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Stock Compensation Plans (Performance Award Activity) (Details) - Performance Awards
9 Months Ended
Sep. 30, 2021
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding [Roll Forward]  
Shares awarded but not earned/vested, beginning of period (in shares) 582,952
Shares awarded (in shares) 281,310
Shares forfeited (in shares) (12,238)
Shares vested (in shares) (142)
Shares awarded but not earned/vested, end of period (in shares) 851,882